Network Timing Interfaces; External Alarm Inputs; Management Interfaces; Power Supply And Fans - Cisco ASR-920-24SZ-IM Hardware Installation Manual

Overview
• GE SFP ports (copper)—supports 10/100/1000 operation (ASR-920-24TZ-M)
• 10GE SFP+—supports 10G mode.

Network Timing Interfaces

Network timing interface is available only on Cisco ASR-920-24SZ-IM Router.
Note
• BITS input or output—The BITS interfaces support clock recovery from either a T1 at 1.544 MHz or
an E1 at 2.048 MHz, configurable by software. BITS interface is provided through a standard RJ-48
connector on the front panel.
• 1PPS input or output and ToD input or output—This shielded RJ-45 interface is used for input or output
of time-of-day (ToD) and 1PPS pulses. ToD format includes both NTP and IEEE 1588-2008 time
formats.
The same RS422 pins for 1PPS and TOD are shared between input and output directions. The direction for
each can be independently configurable through software.
• GPS 10 Mhz input and output—10 MHz input for GPS Synchronization. This connector on the front
panel can provide 10MHz output as well from Cisco ASR-920-24SZ-IM Router. The direction can be
configured using software.
• GPS 1 PPS input and output—1 PPS input for GPS Synchronization. This connector on the front panel
can provide 1 PPS output as well from Cisco ASR-920-24SZ-IM Router. The direction can be configured
using software.

External Alarm Inputs

The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router supports four dry contact alarm
inputs through an RJ-45 jack on the front panel.
• Normally Open—indicates that no current flows through the alarm circuit and the alarm is generated
when the current is flowing.
Each alarm input can be provisioned as critical, major, or minor.

Management Interfaces

The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router have the following management
interfaces:

Power Supply and Fans

The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router support either AC or DC power
supplies in a 1+1 redundant configuration. The PSUs are hot-swappable. Load is shared between PSUs when
both the PSUs are inserted and powered-up. Status LED provided on both AC and DC PSU indicates the
status and output condition.
Cisco ASR-920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Aggregation Services Router Hardware Installation
External Interfaces
Guide
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